Runs but does not cool well
What you see
Air comes out lukewarm, or cold at first then weaker, or the room never reaches the set temperature.
Likely causes
Dirty filters and coils, an outdoor unit starved of air or in direct sun, a weak compressor capacitor, low refrigerant from a leak, or a capacity too small for the room.
Safe to try
Check the remote mode and filter condition using the manual. Note outdoor-unit sounds and fan movement from a safe position; air temperature alone does not confirm the compressor condition.
Technician
Measures the temperature drop across the indoor unit, pressures and current, then decides: cleaning, electrical, or refrigerant circuit.


